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authorKevin Wolf <kwolf@redhat.com>2014-05-20 12:24:05 +0200
committerKevin Wolf <kwolf@redhat.com>2014-08-15 15:07:15 +0200
commit7d2a35cc921ea4832083a7e8598461868bb538ce (patch)
tree0aabab68f9ae59485bba04d9fe374ed0e603af1e
parent23d20b5b4fb7bde102e6779b7a13b88375e4db66 (diff)
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block: Introduce qemu_try_blockalign()
This function returns NULL instead of aborting when an allocation fails. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
-rw-r--r--block.c13
-rw-r--r--include/block/block.h1
-rw-r--r--include/qemu/osdep.h1
-rw-r--r--util/oslib-posix.c16
-rw-r--r--util/oslib-win32.c9
5 files changed, 32 insertions, 8 deletions
diff --git a/block.c b/block.c
index d7cb7d4..3365c05 100644
--- a/block.c
+++ b/block.c
@@ -5258,6 +5258,19 @@ void *qemu_blockalign(BlockDriverState *bs, size_t size)
return qemu_memalign(bdrv_opt_mem_align(bs), size);
}
+void *qemu_try_blockalign(BlockDriverState *bs, size_t size)
+{
+ size_t align = bdrv_opt_mem_align(bs);
+
+ /* Ensure that NULL is never returned on success */
+ assert(align > 0);
+ if (size == 0) {
+ size = align;
+ }
+
+ return qemu_try_memalign(align, size);
+}
+
/*
* Check if all memory in this vector is sector aligned.
*/
diff --git a/include/block/block.h b/include/block/block.h
index d4c816d..e94b701 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -455,6 +455,7 @@ void bdrv_img_create(const char *filename, const char *fmt,
size_t bdrv_opt_mem_align(BlockDriverState *bs);
void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
void *qemu_blockalign(BlockDriverState *bs, size_t size);
+void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
struct HBitmapIter;
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 8480d52..9dd43fc 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -95,6 +95,7 @@ typedef signed int int_fast16_t;
#define qemu_printf printf
int qemu_daemon(int nochdir, int noclose);
+void *qemu_try_memalign(size_t alignment, size_t size);
void *qemu_memalign(size_t alignment, size_t size);
void *qemu_anon_ram_alloc(size_t size);
void qemu_vfree(void *ptr);
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index cdbfb2e..016a047 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -94,7 +94,7 @@ void *qemu_oom_check(void *ptr)
return ptr;
}
-void *qemu_memalign(size_t alignment, size_t size)
+void *qemu_try_memalign(size_t alignment, size_t size)
{
void *ptr;
@@ -106,19 +106,23 @@ void *qemu_memalign(size_t alignment, size_t size)
int ret;
ret = posix_memalign(&ptr, alignment, size);
if (ret != 0) {
- fprintf(stderr, "Failed to allocate %zu B: %s\n",
- size, strerror(ret));
- abort();
+ errno = ret;
+ ptr = NULL;
}
#elif defined(CONFIG_BSD)
- ptr = qemu_oom_check(valloc(size));
+ ptr = valloc(size);
#else
- ptr = qemu_oom_check(memalign(alignment, size));
+ ptr = memalign(alignment, size);
#endif
trace_qemu_memalign(alignment, size, ptr);
return ptr;
}
+void *qemu_memalign(size_t alignment, size_t size)
+{
+ return qemu_oom_check(qemu_try_memalign(alignment, size));
+}
+
/* alloc shared memory pages */
void *qemu_anon_ram_alloc(size_t size)
{
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 507cedd..a3eab4a 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -50,18 +50,23 @@ void *qemu_oom_check(void *ptr)
return ptr;
}
-void *qemu_memalign(size_t alignment, size_t size)
+void *qemu_try_memalign(size_t alignment, size_t size)
{
void *ptr;
if (!size) {
abort();
}
- ptr = qemu_oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
+ ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
trace_qemu_memalign(alignment, size, ptr);
return ptr;
}
+void *qemu_memalign(size_t alignment, size_t size)
+{
+ return qemu_oom_check(qemu_try_memalign(alignment, size));
+}
+
void *qemu_anon_ram_alloc(size_t size)
{
void *ptr;